Trying to find information on a crucifix found whilst metal detecting

I am trying to find the age of a silver cross that I have found on a site that had a benedictine priory on it from 1149 to 1540. I believe that clues to its age are the use of a two bar Patriarchal Cross with "IHC" on the top bar. Jesus' head is bowed No wound mark in the abdomen, although wound marks on the hands and feet. I would appreciate any advice as to age that you could provide. Thanks Kev Johnstone